import * as React from "react";
import { FileAttachmentDropAreaImplProps } from "./FileAttachmentDropArea.definitions";
export declare class FileAttachmentDropAreaImpl extends React.Component<FileAttachmentDropAreaImplProps> {
    state: {
        dragging: boolean;
        isError: boolean;
    };
    checkIfError: () => void;
    attachFiles: (fileList: FileList) => void;
    handleDragOver: (e: React.DragEvent) => void;
    handleDrop: (e: React.DragEvent<HTMLDivElement>) => void;
    handleDragLeave: (e: React.DragEvent) => void;
    render(): JSX.Element;
    private containsFile;
}